Rotary force-pump.



BRA FTSMAM No. 7381101; PATENTED SEPT. 1, 1903. H. P. CURTIS. ROTARY FORGE PUMP.

APPLIOATION FILED MAR. 9. 1903. N0 MODEL 3 SHEETS-SHBET 1.

#Efiinafffiilllifi i N0 MODEL.

DRAFTSMJQN.

PATENTBD SEPT. 1, 1903. H. P. CURTIS.

ROTARY FORGE PUMP.

APPLICATION FILED MAR. 9, 1903.

3 SHBBTSSHEET 2.

PATENTED SBPT.-l, 1903.

H. P. CURTIS ROTARY FORGE PUMP.

APPLIOATION F-ILED MAR. 9. 1903.

3 SHEETSSHEET 3.

N0 MODEL.

I I II! villi!!! lll ll UNITED STATES iatented September 1, 1903. PATENT OFFICE.

HOMER-P. courts, on DENVER, COLORADO, ASSIGNOR OF ONE-FOURTH To GLYNN B. STANNARD AND JOHN B. WATERBURY, OF DENVER, COLORADO.

ROTARY FORCE-PUMP.

SPECIFICATION forming part of Letters PatentNo. 738,101, dated September 1, 1903.

Application filed March 9, 1903. Serial No. M7304. (No model.)

lo all whom it may concern.-

Beit-known that I, HOMER P. CURTIS, acitizen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Rotary Force-Pu mps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to to which it appertaius to make and use the same, reference being had to the accompanying' drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in rotary force-pumps, my object being toprovide an apparatus of this class which shall be simple in construction, economical in'cost, reliable, durable, and efiicient in use; and to no these ends the invention consists of the features, arrangements, and combinations hereinafter described and claimed, all of which will be fully understood by reference to the accompanying drawings, in which is illus- :5 trat'edan embodiment thereof.

In the drawings, Figure 1 is a side elevation of my improved rotary pump. Fig. 2 is a vertical cross-section taken on the line 2 2, Fig. 1. Fig. 3 is an end view of the pump 0 with one head removed, the shaft being shown in section and the position of the cam indicated by dotted lines. This view is in the direction of the arrow looking toward the left in Fig. 5. Fig. 4 is a similar view look-' 3 5 ing toward the right in Fig. 5Tthat is to say, with the left head of the cylinder removed and the impeller-closing cam indicated by dotted lines. Fig. 5 is asectiou taken on the line 5 5, Fig. 4. Fig. 6 is a longitudinal section taken through the rotary piston on the line 6 6, Fig. 3. Fig. 7 is a detail face view of one of the impellers carried by the rotary piston. Fig. 8 is an end elevation of the same. The same reference characters indicate the same parts in all the views.

Let'the numeral 5 designate a suitable base, upon which the body part 5 of the-cylinder is secured by bolts 6. To the opposite ends of the cylinder-body 5 are secured the heads 5o 7 and 8, respectively, having extension-inurnals 7 and 8, through which the shaft 9 passes. This shaft is continuous through the machine, and upon it is-mounted and made fast a cylindrical rotary piston 10, keys 12 being employed for locking the said piston 55.

to the shaft. The piston is provided with cavities formed in two opposite sides, adapted to receive impellers 13, each of which has a lip 13", adapted to engage the inner wall of the cylinder when the impeller is thrown 6o outwardly or to the operative or open posi--. tiom, as shown at the left in Fig. 2. This is the wearing part of the impeller and is pref erably composed of steel or hardened metal and is detachable,whereby it may be removed 6 5 when worn and a new wearing part substituted at small cost. This lip projects slightly from the body of the impeller and when in the closed position engages a recess 10, formed in the piston. The impellers when in the closed position just fill the cavities in the opposite sides of the piston and make the latter a perfect cylinder between its end flanges 10. These flanges 10 of the piston engage the inner wall of the cylinder and form end walls, closing the ends of the annu-- lar pocket or water-space 14: between the piston and cylinder. The projecting part of each impeller travels in this water space or pocket. The water enters the pocket by way of a suction or inlet port 15 and escapes therefrom by way of an outlet or discharge port 16. At one side of the discharge-port and between it and the suction-port is inserted a key or abutment 17, which is passed through a slot formed in the wall of the cylinder and forms a partition, separating the water drawn into the pocket through the one port from the waterdischarge from the pocket through other port. drawings, is formedintegral with a plate 18, which projects on opposite sides of the slot and is secured to the cylinder by screws 19. The port 15 communicates with a conduit 20, connected with the water-supply source and which is secured to the cylinder by screws 22, passed through a plate 21, connected with the conduit. The body of each impeller is of sufficient length to just fit into the pocket/be This abutment, asshown in the 0 tween the flanges 10 of the piston and close we the said pocket when the impeller is open. Each impeller has two journals 13, which engage bearings formed in the ends of the piston, as best shown in Fig. 6. Each journal 13 protrudes beyond the end of the rotary piston. One protruding extremity of each impeller-journal, being that toward the left in Fig. 6, is provided with a crank 23, whose extremity remote from the journal is provided with an antifrictional roller 24, adapted to engage acam 25, mounted on the cylinder-head, every time the piston makes a revolution. This cam is so located as to close the impeller when it reaches the discharge or outlet port 16 and just before it reaches the abutment 17, whereby the impeller is allowed to pass the abutment. Each impeller is closed by this cam once during each revolution of the piston and just long enough to allow it to pass the discharge-port and the abutment. The opposite protruding journal of each impeller is provided with a segmental gear 26, which meshes with a similar gear 27, provided with a crank 28, whose extremity remote from the gear is provided with an antifrictional roller 29. The segmental gear 27 and its crank 28, which, as shown in the drawings, are formed integral with each other, are journaled on a stud 30, mounted on the extremity of the piston. As shown in the drawings, each stud is fast on a plate 31, secured to the end of the piston by screws 22. These plates close the impeller-cavities at the ends of the piston and are flanged to overlap the piston at the end to make room for the fastening-screws. The opposite end of the piston is also provided with corresponding plates 33, which the impeller-journals 13 directly engage. These plates are employed as a matter of convenience in manufacturing the piston, whereby the impeller-cavities are continued entirely through the piston ends and then closed by these segmental plates. Each crank-roller 29 engages a cam 35, mounted on the adjacent head of the cylinder, whereby the impeller is kept open while traveling from the inlet to the discharge-port of the cylinder.

From the foregoing description it is believed that the use and operation of my improved rotary pump will be readily understood. Assuming that the parts are in the position shown in Figs. 2, 3, and 4, the operation will now be described. In Figs. 2 and 4 the parts are viewed in the same direction, while in Fig. 3 they are viewed from the opposite direction. Hence the arrows which indicate the rotation of the piston pointin the same direction in Figs. 2 and 4 and in the opposite direction in Fig. 3. It will therefore be understood that the impellers and their connections which are located at the right and left, respectively, in Figs. 2 and 4 are atthe left and right, respectively, in Fig. 3. The impeller at the right in Fig.2 hasjust reached the key or abutment 17 and has been closed by the engagement of its crank 23 with the cam 25 on the adjacent head of the cylinder. At the same time the opposite impeller is open and has beenheld open by the engagement of one of the cranks 28 with the opening cam 35 and by virtue of the engagement of the gear 27 of the last-named crank with the gear 26 of the impeller. The open impeller is driving the water before it in the pocket 14 and forcing the water out through the discharge opening 16, and at the same time the water is drawn into the pocket by way of the opening in the rear-of the open impeller by suction or by reason of the formation of a partial vacuum in the pocket after the impellerleaves the inlet-openingQ The open impeller will continue to drive the water before it out of the opening 16 and to draw it into the pocket in the rear until the said impeller reaches or approaches the discharge-opening. Near this discharge-opening and above the same, as shown in Fig. 2, the inner surface of the cylinder is cut away, starting at a point A and gradually increasing in depth to the opening 16. The cutaway portion of the cylinder forms a space B outside of the impeller as it approaches the opening 16 and allows the water to pass to the rear of the impeller for the purpose of balancing the latter in order to reduce the power required to close the impeller. In order to further facilitate the balancing of the impeller, an orifice O is formed through its center to a small chamber D, formed between the impeller and the piston, but closed at both ends to prevent leakage between the impeller and the piston. This construction greatly reduces the friction between the piston and the impeller, since only a portion of the adjacent surface of the impeller is in direct engagement with the piston, and when the piston reaches the space 13 (at which point the impeller begins to close) it will be entirely surrounded by water except where it engages the piston at the ends of the chamber D,and is therefore very nearly perfectly balanced, whereby but little power will be required to close the impeller as it approaches the key or abutment 17. Stops 41 (see Fig. 4) may be applied to the end plates adjacent the cranks 23 in order to form a positive lock to prevent the lips of the impellers from moving out into the space 13 as they approach the discharge-opening. The cam will hold the impeller closed until it passes the abutment 17, after which the impeller will be released from the influence of the closing cam and will be, acted on by the opening cam through the instrumentality of a crank and the meshing segmental gears 27 and 26. The impeller is fully open by the time its lip 13 reaches the opposite or farther side of the opening 15, when this impeller carries the water before it and sucks in water behind it, whereby there is a continual outward flow of water through the opening 16 and a continuous inflow of water through the opening 15. By the time-either impeller has reached the space E and allows the water to .pass to its rear the other impeller has passed ICO beyond the inlet-opening 15. Consequently there can be no backward flow of water through the inlet-opening.

The apparatus is provided with two drainpipes 37, leading from the end chambers 36 and communicating with the suction-conduit 20, for the purpose of drawing oif any water that may have leaked into the said end chambers from the annular water space or pocket in which the impellers travel.

Attention is called to the fact that my improved apparatus may be used to pump gases as well as liquids. It is also evident that sub.- stantially the same construction may be used as a motor operated either by liquid or gases.

- Having thus described my invention, what I claim is i 1. In a rotary force-pump, the combination with a casing having inlet and discharge openings, of a piston revoluble in the casing, impellers carried by the piston and journaled therein, the impellers being located in cavities formed in the piston, the latter having flanges at the ends closing the water-space between the piston and easing, said space communicating with the inlet and discharge opening of the casing, a key or abutment closing the water-space between the inlet and the discharge opening, and suitable means for a go a ulgigtp'ealiyppeningandclosing the impel- Ters at predetermined intervals, whereby the water is driven through the water-space in front of theimpellers and out of the dischargeopening, and drawn into said space behind the impellersfrom the inlet-opening, said means being located in the chamber formed between the end of the piston and the end of the casing, and arranged to act on the impeller-journals which protrude into the said chamber.

2. The combination with a casing having a cylindrical chamber and provided with inlet and discharge openings, a piston revoluble in said chamber and having a water-pocket closed at the ends, impellers carried by the piston and journaled therein, chambers being formed between the ends of the piston and the ends of the casing, a stop located in the water-pocket between the inlet and discharge opening, and means interposed between the ends of the piston and the ends of the casing and located in the said end chambers for operatin g the impellers whose journals protrude into the said end chambers,whereby theimpellers are alternately opened and closed with reference to the water-pocket, through which pocket the water is driven by the impellers when open, from the inlet to the discharge opening, the water being drawn into the pocket by the impellers by suction.

3. A rotary force-pump, comprising a cas= ing having inlet and discharge openings, a piston revolubly mounted in said casing, a water-pocket being formed between thepiston and easing, with which the outlet and discharge openings communicate, a stop located in said pocket between the inlet and discharge openings, impellers carried by the piston and journaled therein, their journals protruding through the ends of the piston into a'space formed between the ends of the piston and the ends of the casing and shut off from the water-pocket, and means interposed in the said space and acting on the impeller-journals, for alternately opening and closing the impellers at predetermined intervals.

4. The combination with a casing, of a piston revoluble therein and provided with chambers, impellers movably mounted in said chambers and having journals'protruding through the ends of the piston into a space formed between the ends of the piston and 'the ends of the casing, an annular pocket formed between the piston and easing into which the impellers project when open, cams mounted on the ends of the casing, and means mounted on the piston and adapted to engage the cams and act on the impeller-journals for alternately opening and closing the impellers.

5. The combination with a casing having inlet and discharge openings, of a piston journaled in the casing, a space beingleft between the ends of the piston and the ends of the casing, an annular pocket being formed between the piston and the casing, the said pocket being closed from the end chambers, a stop located in said pocket between the inlet and discharge openings, impellers carried by the piston and having journals protruding through the piston ends into the end chambers between the piston and casing, cranks mounted on the piston and connected with the impeller-journals, and cams mounted on the casing ends and engaged by the pistoncranks for operating the impellers whereby they are alternately opened and closed.

6. The combination with a casing, of apiston journaled therein, impellers journaled in the piston, an annular pocket being formed between the piston and casing, inlet and discharge openings communicating with the said pocket, a stop located in the pocket between said openings, cranks mounted on the piston ends, cams mounted on the casing ends and adapted to be engaged by the cranks as the piston rotates, and a suitable operative connection between the cranks and the impellers.

7. The combination with a casing having inlet and discharge openings, a piston revoluble in the casing, an annular water-pocket being formed between the piston and casing, said pocket communicating with the inlet and discharge openings, a stop located in the pocket between said openings, impellers carried by the piston and having journals protruding into chambers formed between the piston ends and the ends of the casing, cranks mounted on one journal of each impeller and located in one end chamber, a cam mounted/- on the casing and adapted to be engaged by the said cranks for operating the impellers, gears mounted on the opposite journals of the impellers, cranks j ournaled on the piston and provided with gears meshing with the impell 4 isaioi ler-gears, and a cam mounted on the casing I said space to allow the water to enter for the and engaged by the cranks for operating the impellers, the cams, cranks and gears being so arranged at the opposite ends of the piston, that each impeller is alternately actuated in opposite directions.

8. The combination wig a casing having inlet and discharge openi gs, a piston revolubly mounted therein, an annular chamber with which the inlet and discharge openings communicate, impellers movable on the piston, end chambers closed from the annular water-space, means located in the said end chambers for alternatelyopening and closing the impellers, a stop on the annular chamber between the inlet and discharge openings, the said chamber being gradually enlarged as it approaches the discharge-opening whereby a space is formed between the open impeller and the wall of the cylinder, to allow the water to flow rearwardly and balance the impeller and thereby lessen the power required purpose of balancing the impeller and reducing the power required to operate it.

10. The combination withacylinder,a shaft journaled therein, means for operating the shaft, of a' piston fast on the shaft and located in the cylinder, impellers movably mounted in cavities formed in the piston, and adapted to enter an annular water-chamber formed between the piston and cylinder, cams mounted on the cylinder at the ends of the piston, and means connected with the impellers and operated by the cams for alternatelyopening and closing the impellers, substantially as described.

11. The combination with a cylinder and a rotary piston located therein and provided with means for forcing fluid from an inlet opening to a diSchargeopening, the cylinder having end chambers, of drain-pipes leading from the said chambers in order to carry off y gas or liquid that may escape from the passage through which the gas or liquidis traveling.

In testimony whereof I affix my signature in presence of two witnesses.

HOMER P. CURTIS.

Witnesses:

DENA NELSON, A. J. OBRIEN. 

